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Abstract

Reddish Au condensates, predominant atom clusters and minor amount of multiply twinned
particles and fcc nanoparticles with internal compressive stress, were produced by
pulsed laser ablation on gold target in de-ionized water under a very high power density.
Such condensates were self-assembled as lamellae and then nano- to micro-diameter
tubes with multiple walls when aged at room temperature in water for up to 40 days.
The nano- and micro-tubes have a lamellar- and relaxed fcc-type wall, respectively,
both following partial epitaxial relationship with the co-existing multiply twinned
nanoparticles. The entangled tubes, being mesomorphic with a large extent of bifurcation,
flexibility, opaqueness, and surface-enhanced Raman scattering, may have potential
encapsulated and catalytic/label applications in biomedical systems.